Window sash balance



July 5,' 1938. A. LARSON WINDOW SASH BALANCE Filed Jan. 21, 1938Patented July 5, 1938 WINDOW SASH BALANCE Aigot Larson, New York, N. Y.,assignor to Unique Balance Company, New York, N. 1., a corporation ofIllinois Application January 21, 1938, Serial No. 186,065

2 Claims. (01. 1619'l) UNITED STATES PATENT OFFICE 1 This inventionrelates to window sash balances of the general character of that shownin Letters Patent of the United States No. 2,041,646, dated May 19,1936, granted to Unique Balance Compam as the assignee of Algot' Larson,in which each sash is counterbalanced by a coiled spring or coiledsprings with which is associated a metal tube for the purpose ofpreserving the slimment of the spring or springs andin which in o themovement of the sash there is more or less relative movement in contactas between the tube and the spring or springs. It has been found that inthe operation of such window sash balances that in the movement of thesash there is some grating noise caused by the relative movement of thespring or springs and the tube in contact and some condensation ofmoisture on the surface of'the tube, either internal or external, whichtends to cause corrosion of the spring or springs. It is the object orthis invention to provide means for deadening the sound and, as well,for absorbing such moisture and in accordance with the invention thereis provided for such tube, either externally or internally or both, alining, as of paper or other similar material, whichin practicaloperation has been found to overcome the difficulties referred to.

In the drawing, in which the invention is illustrated- Figure 1 is aview, partly in elevation and partly in section, of a window to whichthe invention is applied.

Figure 2 is a view in perspective of a strip of sheetmetal, adaptedi'orthe formation of the tube, with the paper-like lining appliedthereto. partly broken away.

Figure 3 is a cross-section or the same on a larger scale.

Figure 4 is a view in cross-section of a tube 40 with the paper-likeliningsapplied thereto.

Figure 5 is a detail view of the same in'vertical section, thecounterbalance springs and spiral being also shown, and

Figure 6 is a detail view similar to Figure 3.

5 but showing the lining applied to both sides of themetal sheet fromwhich the tube is formed.

Thewindow frame, in which the present invention is to be embodied, mayhave as usual a head or lintel a, a jamb a with a parting strip a and asill a the upper sash b and'the lower sash b being arranged to movevertically in the frame. For each upper sash and each lower sash thereis provided at each side a. counterbalance which, as fully explained insaid Letters Patent, is connected to the respective sash, suchcounterbalance comprising an alining tube 10 c, an internal torsionspring (2, a long spiral member e, and an external supplementalextension spring a.

The alining tube 0 is formed of a metal strip 0 whichhas secured to it,as by cement,.before 15 rolling, at one side, as shown in Figures 2 and3,

a lining sheet c of paper or other similarmaterial, or as shown inFigures 4, 5 and 6, at the other side also, a similar lining sheet 0Tough paper is found to be a suitable material for the 20 linings.

It will now be understood that such lining of the tube, whether internal'or external, serves to deaden the sound due to the relative movement incontact of the adjacent internal spring or ex- 25 ternal spring or both,as the case may be, and serves also to absorb such moisture as maygather on the adjacent surface of the tube and so protect the spring orsprings from corrosion.

I claim as my invention: 0 I

1. In a window sash balance, the combination of a counterbalance spring,and a metal springalining tube, the tube having adjacent the spring alining of paper-like material whereby the sound of relative movementbetween the spring and the tube is deadened and provision is made forabsorption of moisture.

2. In a windowsash balance, the combination of a metal spring-aliningtube, a torsional spring within the tube, and a tension spring outsidethe 40 tube, the tube having on each side a lining of paper-likematerial whereby the sound of relative movement between the springs andthe tube isdeadened and provision is'made for absorption of moisture.

' ALGOT LARSON.

